Reflector for gas-lamps.



A. B. MITCHELL. REFLECTOH FOR GAS LAMPS. APPLICATION man Aue.21,191s.

Patented .Du 25, 1917".l

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ARTHUR B. MITCHELL, or BIRMINGHAM, ALABAMA.

REFLECTOR FOR GAS-LAMPS.

Specification of Letters Patent. Patented Dec. 25, 1917.

Application filed August 21, 1916.- Serial No. 116,050.

To all whom t may concern:

Be it known that I, ARTHUR B. MITCHELL, a citizen of the UnitedStates ofAmerica, residing at Birmingham, in the county of Jefferson and State ofAlabama, have invented certain new and useful Improvements in Reflectorsfor Gas-Lamps, of which the following is a speciiication.

My present invention relates to-an kimprovement in reflectors for minersacetylene gas lamps which is especially designed to protect the flameagainst being extinguished by air currents coming from any direction,and particularly by strong air currents blowing directly against theburner flame.

The reflector, in accordance with my present invention, is provided witha raised guard surrounding the burner tip and having air ports soarranged as to permit the direct currents of air to pass inwardlythrough the guard and into the burner chamber below the fla-me where areverse outward current of air is set up to protect the flame.Preferably the guard is extended well beyond the burner tip so as todirectly shield it from lateral drafts, and it is preferably contractedto form a restricted flame throat.

My invention further comprises the novel details of construction andarrangements of parts, which in their preferred embodiment vonly arehereinafter more particularly described and illustrated in theaccompanying drawings which form a part of this specification, and inwhich Figure 1 presents the reflector and burner in front elevation.

Fig. 2 is a cross sectional view on the line 2-2 of Fig. 1.

Similar reference numerals refer to similar parts throughout thedrawings.

I have illustrated my invention applied to a miners acetylene gasburning lamp 1, the design of which is typical of any gas burning lamp.This lamp comprises a burner tube 2 leading horizontally through itsside wall and terminating in a burner tip 3 which has lateral air ports4 disposed without the lamp and adjacent to the tip. Theremay be anydesired number of holes 4 and they preferably surround the burner. Theburner tip passes through-'a circular base 5 shaped to conform to theside wall of the lamp tok which it is soldered or made fast in anydesired manner. Upon this base is mounted the reflector preferably of adish shaped or bell-like character and which preferably comprises aflattened baclrportion 6 which rests on and is rigidly attached to thebase 5. Around the outer' edge of this back portion 6 is an annularconvexly curved Vreflecting wall S and around the inner edge of thebaclr'is the guard formed by an outer annular. wall 9 which curvesoutwardly and over and inwardly to form a contracted neclror throat 10opposite the tip 3,-whence the metal is drawn inj on a reverse curveinwardly as the inner wall 11 of the guard, which at its inner end iscurved toward and Vjoins' the burner tube and, if desired, may

be spot welded orfsecured to the `base 5. In the outer portion of thewall 9 of the guard, I provide a plurality of air inlet ports 12surrounding the guard and adapted to admit the air currents comingdirectly fromthe front into the air distributing chamber 13 formedbetween the walls y9 and 11 ofthe guard from whence the air flows from aseries of ports 14 in the wall 11 into the air chamber 15 surroundingthetip.- This chamber'is bulbous or pear shaped in its preferred form.These ports 14 `are preferably. arranged so that theair enters thelchamber 15 therethrough in position to have access` to the burnerthrough air ports 4 and to create a counter-draft outward toward thethroat 10 which will protect the flame at the .tip

from being extinguished by a direct draft blowing toward the throat.Preferably the holes 12 and 14 are relatively staggered. so

that the entering air becomes distributed through the chamber 13 and ismoved outwardly through the holes 14 responsive to the pressure in thechamber 13 caused by the wind. Moreover, it will be noted that vthe wall11 is so curved as'to prevent the tendency of direct drafts between theports 12 and'14. V-

The reflector may be provided with air exhaust holes wherever suited,such .being exemplified by the series of holes 16 surrounding the baseof the flange 8. v I

In operation, the guard positively protects the burner tip from any windcurrents except those coming head on into the reflector and under suchYconditions the vcontracted neck 10, as well as the counter-currentsinduced by the.circulationthrough the ports 12 and 14` as indicated bythe arrows in Fig. 2, will effectively protect the flame at the tip andwill prevent the lamp becoming extinguished.

The guard walls are shown as formed integrally with the reflector butthey may be made and applied in any suitable manner so long as they formthe desired guard surrounding the tip. Y

The shape of the reflector proper may be widely varied and it may bemounted in any well known manner on the lamp.

The convex curvature of the flange 8 is preferable as it tends to avoida congestion of air at the back of the reflector. The curvature of thewall 9 tends to deflect the air currents toward the exhaust ports 16,which may be arranged in any convenient manner near the outer margin ofthe back 6. It is not essential that the back wall 6 be flat but shouldnot slope inwardly and away from the ports 16 as that might tend todeflect the air currents from the exhaust ports 16.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is :--v

l. In a concave reflector, a tip projecting from its centersubstantially axially thereof, a guard surrounding the tip and formed byspaced walls connected at their outer ends, there being draft holes inthe outer and inner walls to provide an air circulation outwardly aroundthe tip.

2. In a reflector, a burner tip projecting therethrough, and a guard forthe tip formed byan annular chamber surrounding the tip and closed atits rear end, there being ports to admit air near the outer portion ofthe outer wall and other ports to deliver thc entering air to the burnertip near its outer end.

3. In a reflector, a burner tip projectingv therethrough, and a guardfor the tip formed by an annular chamber surrounding the tip and closedat its rear end, there being ports to admit air near the outer portionof the outer wall and other ports to deliver the entering` air to theburner tip near its outer end, and said tip having side ports for air.

4. In combination, a reflector, a burner tip projecting therethrough,walls projecting outwardly from the reflector and forming an annularchamber which surrounds and guards the tip, said chamber being closedexcept for a series of marginal air ports about its outer wall, and aseries of ports about its inner wall which is spaced from the burner tipto form an air space.

5. In combination, a reflector, a burner tip projecting therethrough,walls projecting `outwardly from the reflector and forming an annularchamber which surrounds and guards the tip, said chamber being closedflector in line with its axis, a guard surrounding the tip and formed byan annular wall which projects outwardly and is bent over and backinwardly to form a contracted flame throat, and a central air chamberwhich enlarges as it approaches the reflector, means to close the backend of the chamber formed between the inner and outer portions of saidwall, there being air ports in the inner and outer portions of saidwalls arranged substantially as described.

In a miners lamp, a dish shaped reflector havinga flattened back, a baseon which the hack is mounted, a burner tip leading outwardly through thecenter of thc back, a guard surrounding the tip and formed by an annulardouble wall which extends outwardly to a point beyond the tip where thewalls join, the outer wall having air ports near its outer end, and theinner Wall being shaped to form a bulbous chamber having air ports nearits base.

8. A reflector having'a back portion, a marginal forwardly projectingconvexly curved flange surrounding the back portion, a burner tip, and aforwardly projecting guard adapted to surround the burner tip, therebeing air exhaust ports arranged around the base of said marginal flangeand air supply ports arranged in the said guard.

9. A reflector having a flattened back Wall, a burner tip, an outermarginal convexly curved reflector flange around said back, and acentral guard which surrounds and protects the burner tip, there beingair exhaust ports near the outer margin of the back and air inlet portsin said guard.

l0. A reflector having a flattened back wall, a burner tip, an outermarginal convexly curved reflector flange around said back, and acentral guard which surrounds and protects the burner tip and is formedby an annular wall reversely curved to the said reflector flange, therebeing air exhaust ports near the back of the reflector.

In testimony whereof I affix my signature.

ARTHUR B. MITCHELL. Witness:

NoMm WELSH.

Copies ot this patent may be obtained for ave cents each, by addressingthe Commissioner o f Patents, Washington, D. C.

